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Message-ID: <202204220147.aPvpcmQ8-lkp@intel.com>
Date: Fri, 22 Apr 2022 01:35:47 +0800
From: kernel test robot <lkp@...el.com>
To: David Howells <dhowells@...hat.com>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: [dhowells-fs:rxrpc-ringless 16/21] net/rxrpc/recvmsg.c:358:17:
warning: variable 'serial' set but not used
tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git rxrpc-ringless
head: c388a8388ad238ffbe0cd204c3eacaf200055751
commit: 58c2a63aa0c47fdeb5fbdab61785fc43cf212fa0 [16/21] changes
config: i386-randconfig-a006 (https://download.01.org/0day-ci/archive/20220422/202204220147.aPvpcmQ8-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project bac6cd5bf85669e3376610cfc4c4f9ca015e7b9b)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=58c2a63aa0c47fdeb5fbdab61785fc43cf212fa0
git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
git fetch --no-tags dhowells-fs rxrpc-ringless
git checkout 58c2a63aa0c47fdeb5fbdab61785fc43cf212fa0
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash net/rxrpc/
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> net/rxrpc/recvmsg.c:358:17: warning: variable 'serial' set but not used [-Wunused-but-set-variable]
rxrpc_serial_t serial;
^
1 warning generated.
vim +/serial +358 net/rxrpc/recvmsg.c
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 346
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 347 /*
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 348 * Deliver messages to a call. This keeps processing packets until the buffer
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 349 * is filled and we find either more DATA (returns 0) or the end of the DATA
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 350 * (returns 1). If more packets are required, it returns -EAGAIN.
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 351 */
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 352 static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call,
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 353 struct msghdr *msg, struct iov_iter *iter,
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 354 size_t len, int flags, size_t *_offset)
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 355 {
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 356 struct rxrpc_skb_priv *sp;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 357 struct sk_buff *skb;
e2de6c40489890 net/rxrpc/recvmsg.c David Howells 2019-08-27 @358 rxrpc_serial_t serial;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 359 rxrpc_seq_t hard_ack, top, seq;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 360 size_t remain;
f9c32435ab7221 net/rxrpc/recvmsg.c David Howells 2019-10-31 361 bool rx_pkt_last;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 362 unsigned int rx_pkt_offset, rx_pkt_len;
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 363 int ix, copy, ret = -EAGAIN, ret2;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 364
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 365 rx_pkt_offset = call->rx_pkt_offset;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 366 rx_pkt_len = call->rx_pkt_len;
f9c32435ab7221 net/rxrpc/recvmsg.c David Howells 2019-10-31 367 rx_pkt_last = call->rx_pkt_last;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 368
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 369 if (call->state >= RXRPC_CALL_SERVER_ACK_REQUEST) {
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 370 seq = call->rx_hard_ack;
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 371 ret = 1;
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 372 goto done;
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 373 }
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 374
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 375 /* Barriers against rxrpc_input_data(). */
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 376 hard_ack = call->rx_hard_ack;
d7e15835ab2784 net/rxrpc/recvmsg.c David Howells 2017-02-24 377 seq = hard_ack + 1;
f9c32435ab7221 net/rxrpc/recvmsg.c David Howells 2019-10-31 378
d7e15835ab2784 net/rxrpc/recvmsg.c David Howells 2017-02-24 379 while (top = smp_load_acquire(&call->rx_top),
d7e15835ab2784 net/rxrpc/recvmsg.c David Howells 2017-02-24 380 before_eq(seq, top)
d7e15835ab2784 net/rxrpc/recvmsg.c David Howells 2017-02-24 381 ) {
3f63ce6fffedc9 net/rxrpc/recvmsg.c David Howells 2022-03-31 382 ix = seq & RXRPC_RX_BUFF_MASK;
3f63ce6fffedc9 net/rxrpc/recvmsg.c David Howells 2022-03-31 383 skb = call->rx_buffer[ix];
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 384 if (!skb) {
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 385 trace_rxrpc_recvmsg(call, rxrpc_recvmsg_hole, seq,
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 386 rx_pkt_offset, rx_pkt_len, 0);
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 387 break;
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 388 }
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 389 smp_rmb();
987db9f7cd1e77 net/rxrpc/recvmsg.c David Howells 2019-08-19 390 rxrpc_see_skb(skb, rxrpc_skb_seen);
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 391 sp = rxrpc_skb(skb);
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 392
e2de6c40489890 net/rxrpc/recvmsg.c David Howells 2019-08-27 393 if (!(flags & MSG_PEEK)) {
e2de6c40489890 net/rxrpc/recvmsg.c David Howells 2019-08-27 394 serial = sp->hdr.serial;
3f63ce6fffedc9 net/rxrpc/recvmsg.c David Howells 2022-03-31 395 serial += call->rx_annotations[ix] & RXRPC_RX_ANNO_SUBPACKET;
58c2a63aa0c47f net/rxrpc/recvmsg.c David Howells 2022-04-06 396 //trace_rxrpc_receive(call, rxrpc_receive_front,
58c2a63aa0c47f net/rxrpc/recvmsg.c David Howells 2022-04-06 397 // serial, seq);
e2de6c40489890 net/rxrpc/recvmsg.c David Howells 2019-08-27 398 }
58dc63c998ea3c net/rxrpc/recvmsg.c David Howells 2016-09-17 399
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 400 if (msg)
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 401 sock_recv_timestamp(msg, sock->sk, skb);
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 402
2e2ea51dec2ab6 net/rxrpc/recvmsg.c David Howells 2016-09-17 403 if (rx_pkt_offset == 0) {
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 404 ret2 = rxrpc_locate_data(call, skb,
3f63ce6fffedc9 net/rxrpc/recvmsg.c David Howells 2022-03-31 405 &call->rx_annotations[ix],
f9c32435ab7221 net/rxrpc/recvmsg.c David Howells 2019-10-31 406 &rx_pkt_offset, &rx_pkt_len,
f9c32435ab7221 net/rxrpc/recvmsg.c David Howells 2019-10-31 407 &rx_pkt_last);
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 408 trace_rxrpc_recvmsg(call, rxrpc_recvmsg_next, seq,
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 409 rx_pkt_offset, rx_pkt_len, ret2);
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 410 if (ret2 < 0) {
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 411 ret = ret2;
2e2ea51dec2ab6 net/rxrpc/recvmsg.c David Howells 2016-09-17 412 goto out;
2e2ea51dec2ab6 net/rxrpc/recvmsg.c David Howells 2016-09-17 413 }
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 414 } else {
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 415 trace_rxrpc_recvmsg(call, rxrpc_recvmsg_cont, seq,
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 416 rx_pkt_offset, rx_pkt_len, 0);
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 417 }
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 418
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 419 /* We have to handle short, empty and used-up DATA packets. */
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 420 remain = len - *_offset;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 421 copy = rx_pkt_len;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 422 if (copy > remain)
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 423 copy = remain;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 424 if (copy > 0) {
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 425 ret2 = skb_copy_datagram_iter(skb, rx_pkt_offset, iter,
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 426 copy);
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 427 if (ret2 < 0) {
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 428 ret = ret2;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 429 goto out;
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 430 }
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 431
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 432 /* handle piecemeal consumption of data packets */
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 433 rx_pkt_offset += copy;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 434 rx_pkt_len -= copy;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 435 *_offset += copy;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 436 }
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 437
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 438 if (rx_pkt_len > 0) {
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 439 trace_rxrpc_recvmsg(call, rxrpc_recvmsg_full, seq,
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 440 rx_pkt_offset, rx_pkt_len, 0);
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 441 ASSERTCMP(*_offset, ==, len);
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 442 ret = 0;
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 443 break;
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 444 }
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 445
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 446 /* The whole packet has been transferred. */
372ee16386bbf6 net/rxrpc/recvmsg.c David Howells 2016-08-03 447 if (!(flags & MSG_PEEK))
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 448 rxrpc_rotate_rx_window(call);
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 449 rx_pkt_offset = 0;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 450 rx_pkt_len = 0;
372ee16386bbf6 net/rxrpc/recvmsg.c David Howells 2016-08-03 451
f9c32435ab7221 net/rxrpc/recvmsg.c David Howells 2019-10-31 452 if (rx_pkt_last) {
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 453 ASSERTCMP(seq, ==, READ_ONCE(call->rx_top));
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 454 ret = 1;
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 455 goto out;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 456 }
d7e15835ab2784 net/rxrpc/recvmsg.c David Howells 2017-02-24 457
d7e15835ab2784 net/rxrpc/recvmsg.c David Howells 2017-02-24 458 seq++;
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 459 }
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 460
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 461 out:
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 462 if (!(flags & MSG_PEEK)) {
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 463 call->rx_pkt_offset = rx_pkt_offset;
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 464 call->rx_pkt_len = rx_pkt_len;
f9c32435ab7221 net/rxrpc/recvmsg.c David Howells 2019-10-31 465 call->rx_pkt_last = rx_pkt_last;
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 466 }
816c9fce12f374 net/rxrpc/recvmsg.c David Howells 2016-09-17 467 done:
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 468 trace_rxrpc_recvmsg(call, rxrpc_recvmsg_data_return, seq,
849979051cbc93 net/rxrpc/recvmsg.c David Howells 2016-09-17 469 rx_pkt_offset, rx_pkt_len, ret);
d0b35a42031a31 net/rxrpc/recvmsg.c David Howells 2018-07-23 470 if (ret == -EAGAIN)
d0b35a42031a31 net/rxrpc/recvmsg.c David Howells 2018-07-23 471 set_bit(RXRPC_CALL_RX_UNDERRUN, &call->flags);
248f219cb8bcbf net/rxrpc/recvmsg.c David Howells 2016-09-08 472 return ret;
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 473 }
17926a79320afa net/rxrpc/ar-recvmsg.c David Howells 2007-04-26 474
:::::: The code at line 358 was first introduced by commit
:::::: e2de6c4048989007b353164b19d6b7d5be4fa9e3 rxrpc: Use info in skbuff instead of reparsing a jumbo packet
:::::: TO: David Howells <dhowells@...hat.com>
:::::: CC: David Howells <dhowells@...hat.com>
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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